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Old January 31st, 2008, 12:07 PM   #38
smasheromalley
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Quote:
Originally Posted by sledder View Post
99 7.3 Powerstroke, 3.73s. Tow everything from a car hauler to 10,000-pound travel trailer in overdrive. Rule of thumb, if you are under 55 mph lock it out or if you are climbing a hill lock it out. Another rule of thumb, stay over 75 mph and don’t worry about shifting out of overdrive. I think the key is don’t let the trans “hunt” or shift back and forth between 3rd and 4th.
x2

IMO only use OD after you have reached your hiway cruising speed
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